Bird in Brazil is scarlet, primarily (4)
I believe the answer is:
ibis
'bird' is the definition.
(ibis is a kind of bird)
'in brazil is scarlet primarily' is the wordplay.
'primarily' says to take the initial letters.
The first letters of 'in brazil is scarlet' is 'IBIS'.
(Other definitions for ibis that I've seen before include "Winger" , "Wader worshipped by ancient Egyptians" , "Flier" , "Bird worshipped in Ancient Egypt" , "Retreat" .)